1 News for the tz database
3 Release 2014j - 2014-11-10 17:37:11 -0800
5 Changes affecting current and future time stamps
7 Turks & Caicos' switch from US eastern time to UTC-4 year-round
8 did not occur on 2014-11-02 at 02:00. It's currently scheduled
9 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
11 Changes affecting past time stamps
13 Many pre-1989 time stamps have been corrected for Asia/Seoul and
14 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
15 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
16 longer guess that Pyongyang mimicked Seoul time after World War II,
17 as this is politically implausible.
19 Some more zones have been turned into links, when they differed
20 from existing zones only for older time stamps. As usual,
21 these changes affect UTC offsets in pre-1970 time stamps only.
22 Their old contents have been moved to the 'backzone' file.
23 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
24 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
25 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
28 Changes affecting commentary
30 The commentary is less enthusiastic about Shanks as a source,
31 and is more careful to distinguish UT from UTC.
34 Release 2014i - 2014-10-21 22:04:57 -0700
36 Changes affecting future time stamps
38 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
39 (Thanks to Ken Rylander for the heads-up.) Guess that future
40 years will use a similar pattern.
42 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
43 that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00.
44 (Thanks to Kiley Walbom for the heads-up.)
46 Changes affecting time zone abbreviations
48 Since Belarus is not changing its clocks even though Moscow is,
49 the time zone abbreviation in Europe/Minsk is changing from FET
50 to its more-traditional value MSK on 2014-10-26 at 01:00.
51 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
53 The new abbreviation IDT stands for the pre-1976 use of UT+8 in
54 Indochina, to distinguish it better from ICT (UT+7).
56 Changes affecting past time stamps
58 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
59 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
60 authoritative book). Asia/Ho_Chi_Minh has been added to
61 zone1970.tab, to give tzselect users in Vietnam two choices,
62 since north and south Vietnam disagreed after our 1970 cutoff.
64 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
65 they differed from existing zones only for older time stamps. As
66 usual, these changes affect pre-1970 time stamps only. Their old
67 contents have been moved to the 'backzone' file.
69 Changes affecting code
71 The time-related library functions now set errno on failure, and
72 some crashes in the new tzalloc-related library functions have
73 been fixed. (Thanks to Christos Zoulas for reporting most of
74 these problems and for suggesting fixes.)
76 If USG_COMPAT is defined and the requested time stamp is standard time,
77 the tz library's localtime and mktime functions now set the extern
78 variable timezone to a value appropriate for that time stamp; and
79 similarly for ALTZONE, daylight saving time, and the altzone variable.
80 This change is a companion to the tzname change in 2014h, and is
81 designed to make timezone and altzone more compatible with tzname.
83 The tz library's functions now set errno to EOVERFLOW if they fail
84 because the result cannot be represented. ctime and ctime_r now
85 return NULL and set errno when a time stamp is out of range, rather
86 than having undefined behavior.
88 Some bugs associated with the new 2014g functions have been fixed.
89 This includes a bug that largely incapacitated the new functions
90 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
91 It also includes some uses of uninitialized variables after tzalloc.
92 The new code uses the standard type 'ssize_t', which the Makefile
93 now gives porting advice about.
95 Changes affecting commentary
97 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
100 Release 2014h - 2014-09-25 18:59:03 -0700
102 Changes affecting past time stamps
104 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
106 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
107 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
109 Some more zones have been turned into links, when they differed
110 from existing zones only for older time stamps. As usual,
111 these changes affect UTC offsets in pre-1970 time stamps only.
112 Their old contents have been moved to the 'backzone' file.
113 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
114 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
115 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
117 Changes affecting code
119 zdump -V and -v now output gmtoff= values on all platforms,
120 not merely on platforms defining TM_GMTOFF.
122 The tz library's localtime and mktime functions now set tzname to a value
123 appropriate for the requested time stamp, and zdump now uses this
124 on platforms not defining TM_ZONE, fixing a 2014g regression.
125 (Thanks to Tim Parenti for reporting the problem.)
127 The tz library no longer sets tzname if localtime or mktime fails.
129 zdump -c no longer mishandles transitions near year boundaries.
130 (Thanks to Tim Parenti for reporting the problem.)
132 An access to uninitalized data has been fixed.
133 (Thanks to Jörg Richter for reporting the problem.)
135 When THREAD_SAFE is defined, the code ports to the C11 memory model.
136 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
137 and two threads race to initialize data used by gmtime-like functions.
138 (Thanks to Andy Heninger for reporting the problems.)
140 Changes affecting build procedure
142 'make check' now checks better for properly-sorted data.
144 Changes affecting documentation and commentary
146 zdump's gmtoff=N output is now documented, and its isdst=D output
147 is now documented to possibly output D values other than 0 or 1.
149 zdump -c's treatment of years is now documented to use the
150 Gregorian calendar and Universal Time without leap seconds,
151 and its behavior at cutoff boundaries is now documented better.
152 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
154 Programs are now documented to use the proleptic Gregorian calendar.
155 (Thanks to Alan Barrett for the suggestion.)
157 Fractional-second GMT offsets have been documented for civil time
158 in 19th-century Chennai, Jakarta, and New York.
161 Release 2014g - 2014-08-28 12:31:23 -0700
163 Changes affecting future time stamps
165 Turks & Caicos is switching from US eastern time to UTC-4 year-round,
166 modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
167 [As noted in 2014j, this switch was later delayed.]
169 Changes affecting past time stamps
171 Time in Russia or the USSR before 1926 or so has been corrected by
172 a few seconds in the following zones: Asia/Irkutsk,
173 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
174 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
175 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
178 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
179 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
180 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
181 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
182 (Thanks to Stephen Colebourne for pointing to the decree.)
184 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
186 A new file 'backzone' contains data which may appeal to
187 connoisseurs of old time stamps, although it is out of scope for
188 the tz database, is often poorly sourced, and contains some data
189 that is known to be incorrect. The new file is not recommended
190 for ordinary use and its entries are not installed by default.
191 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
192 Isle of Man entries.)
194 Some more zones have been turned into links, when they differed
195 from existing zones only for older time stamps. As usual,
196 these changes affect UTC offsets in pre-1970 time stamps only.
197 Their old contents have been moved to the 'backzone' file.
198 The affected zones are: Africa/Bangui, Africa/Brazzaville,
199 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
200 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
202 Changes affecting code
204 Unless NETBSD_INSPIRED is defined to 0, the tz library now
205 supplies functions for creating and using objects that represent
206 time zones. The new functions are tzalloc, tzfree, localtime_rz,
207 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
208 time2posix_z. They are intended for performance: for example,
209 localtime_rz (unlike localtime_r) is trivially thread-safe without
210 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
211 functions, and to Alan Barrett and Jonathan Lennox for helping to
214 zdump now builds with the tz library unless USE_LTZ is defined to 0,
215 This lets zdump use tz features even if the system library lacks them.
216 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
217 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
219 zdump now uses localtime_rz if available, as it's significantly faster,
220 and it can help zdump better diagnose invalid time zone names.
221 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
222 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
223 not available, zdump now uses localtime_r and tzset if available,
224 as this is a bit cleaner and faster than plain localtime. Compile
225 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
226 lacks these two functions.
228 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
229 Although not needed for tz's own applications, which are single-threaded,
230 this supports POSIX better if the tz library is used in multithreaded apps.
232 Some crashes have been fixed when zdump or the tz library is given
233 invalid or outlandish input.
235 The tz library no longer mishandles leap seconds on platforms with
236 unsigned time_t in time zones that lack ordinary transitions after 1970.
238 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
239 already defined, to make it easier to configure on common platforms.
240 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
242 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
243 assumes that reading uninitialized memory yields garbage values
244 but does not cause other problems such as traps.
246 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
247 more likely to guess right for ambiguous time stamps near
248 transitions where tm_isdst does not change.
250 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
251 strftime_l for compatibility with recent versions of POSIX.
252 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
253 to 1 on recent POSIX versions, and to 0 otherwise.
255 tzselect -c now uses a hybrid distance measure that works better
256 in Africa. (Thanks to Alan Barrett for noting the problem.)
258 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
259 or when time_tz is defined.
261 When HAVE_UTMPX_H is set the 'date' command now builds on systems
262 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
263 the date it updates the wtmpx file if _PATH_WTMPX is defined.
264 This affects GNU/Linux and similar systems.
266 For easier maintenance later, some C code has been simplified,
267 some lint has been removed, and the code has been tweaked so that
268 plain 'make' is more likely to work.
270 The C type 'bool' is now used for boolean values, instead of 'int'.
272 The long-obsolete LOCALE_HOME code has been removed.
274 The long-obsolete 'gtime' function has been removed.
276 Changes affecting build procedure
278 'zdump' no longer links in ialloc.o, as it's not needed.
280 'make check_time_t_alternatives' no longer assumes GNU diff.
282 Changes affecting distribution tarballs
284 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
285 the tzdata tarball instead of the tzcode tarball, since they help
286 maintain the data. The NEWS and Theory files are now also
287 distributed in the tzdata tarball, as they're relevant for data.
288 (Thanks to Alan Barrett for pointing this out.) Also, the
289 leapseconds.awk file is no longer distributed in the tzcode
290 tarball, since it belongs in the tzdata tarball (where 2014f
291 inadvertently also distributed it).
293 Changes affecting documentation and commentary
295 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
296 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
299 The man pages have been updated to use function prototypes,
300 to document thread-safe variants like localtime_r, and to document
301 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
304 The fields in Link lines have been renamed to be more descriptive
305 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
306 and LINK-TO has become LINK-NAME.
308 tz-link.htm mentions the IETF's tzdist working group; Windows
309 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
311 Some broken URLs have been fixed in the commentary. (Thanks to
314 Commentary about Philippines DST has been updated, and commentary
315 on pre-1970 time in India has been added.
318 Release 2014f - 2014-08-05 17:42:36 -0700
320 Changes affecting future time stamps
322 Russia will subtract an hour from most of its time zones on 2014-10-26
323 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
324 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
325 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
326 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
327 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
328 (Europe/Samara) are not changing their clocks. The changed zones are
329 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
330 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
331 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
332 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
333 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
334 but not its UTC offset. Two zones are added: Asia/Chita (split
335 from Asia/Yakutsk, and also with two hours subtracted) and
336 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
337 subtracted). (Thanks to Tim Parenti for much of the above.)
339 Changes affecting time zone abbreviations
341 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
342 and similarly for the other Australian zones. That is, for eastern
343 standard and daylight saving time the abbreviations are AEST and AEDT
344 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
345 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
346 This change does not affect UTC offsets, only time zone abbreviations.
347 (Thanks to Rich Tibbett and many others.)
349 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
350 effective 2014-10-26 at 02:00 local time.
352 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
353 has been changed from URUT to XJT. (Thanks to Luther Ma.)
355 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
356 Similarly, prefer EET/EEST for eastern European time in Russia.
358 Change time zone abbreviations in (western) Samoa to use "ST" and
359 "DT" suffixes, as this is more likely to match common practice.
360 Prefix "W" to (western) Samoa time when its standard-time offset
361 disagrees with that of American Samoa.
363 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
365 Time zone abbreviations have been updated for Japan's two time
366 zones used 1896-1937. JWST now stands for Western Standard
367 Time, and JCST for Central Standard Time (formerly this was CJT).
368 These abbreviations are now used for time in Korea, Taiwan,
369 and Sakhalin while controlled by Japan.
371 Changes affecting past time stamps
373 China's five zones have been simplified to two, since the post-1970
374 differences in the other three seem to have been imaginary. The
375 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
376 removed; backwards-compatibility links still work, albeit with
377 different behaviors for time stamps before May 1980. Asia/Urumqi's
378 1980 transition to UTC+8 has been removed, so that it is now at
379 UTC+6 and not UTC+8. (Thanks to Luther Ma and to Alois Treindl;
380 Treindl sent helpful translations of two papers by Guo Qingsheng.)
382 Some zones have been turned into links, when they differed from existing
383 zones only for older UTC offsets where data entries were likely invented.
384 These changes affect UTC offsets in pre-1970 time stamps only. This is
385 similar to the change in release 2013e, except this time for western
386 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
387 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
388 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
389 Atlantic/St_Helena. This also affects the backwards-compatibility
390 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
391 Tim Parenti, and David Patte for reporting problems in earlier
392 versions of this change.)
394 Asia/Shanghai's pre-standard-time UT offset has been changed from
395 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
396 transition to standard time has been changed from 1928 to 1901.
398 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
399 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
400 In 1946 it observed DST from 05-15 through 09-30; in 1947
401 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
402 (Thanks to Yu-Cheng Chuang.)
404 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
406 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
407 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
409 Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
412 Pacific/Chatham has been changed to New Zealand standard time plus
413 45 minutes for the period before 1957, reflecting a 1956 remark in
414 the New Zealand parliament.
416 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
417 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
418 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
419 not 04-06 at 02:00; and there was no DST in 1920.
421 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
423 Time in Russia before 1927 or so has been corrected by a few seconds in
424 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
425 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
426 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
427 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
429 Changes affecting data format
431 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
432 The new file's extended format allows multiple country codes per zone.
433 The older file is still installed but is deprecated; its format is
434 not changing and it will still be distributed for a while, but new
435 applications should use the new file.
437 The new file format simplifies maintenance of obscure locations.
438 To test this, it adds coverage for the Crozet Islands and the
439 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
441 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
442 It is still ASCII now, but commentary about the switch has been added.
443 The new file 'zone1970.tab' already uses UTF-8.
445 Changes affecting code
447 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
448 is defined. (Thanks to Elliott Hughes for reporting the problem.)
450 'zic' no longer mishandles input when ignoring case in locales that
451 are not compatible with English, e.g., unibyte Turkish locales when
452 compiled with HAVE_GETTEXT.
454 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
455 they no longer use ASCII '-' as if it were a dash.
457 'zic' now rejects output file names that contain '.' or '..' components.
458 (Thanks to Tim Parenti for reporting the problem.)
460 'zic -v' now warns about output file names that do not follow
461 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
462 David Olson for starting the ball rolling on this.)
464 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
466 Changes affecting build procedure
468 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
469 (Thanks to John Cochran.)
471 Changes affecting documentation and commentary
473 The 'Theory' file documents legacy names, the longstanding
474 exceptions to the POSIX-inspired file name rules.
476 The 'zic' documentation clarifies the role of time types when
477 interpreting dates. (Thanks to Arthur David Olson.)
479 Documentation and commentary now prefer UTF-8 to US-ASCII,
480 allowing the use of proper accents in foreign words and names.
481 Code and data have not changed because of this. (Thanks to
482 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
485 Non-HTML documentation and commentary now use plain-text URLs instead of
486 HTML insertions, and are more consistent about bracketing URLs when they
487 are not already surrounded by white space. (Thanks to suggestions by
490 There is new commentary about Xujiahui Observatory, the five time-zone
491 project in China from 1918 to 1949, timekeeping in Japanese-occupied
492 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
493 warlord Jin Shuren in the data.
495 Commentary about the coverage of each Russian zone has been standardized.
496 (Thanks to Tim Parenti).
498 There is new commentary about contemporary timekeeping in Ethiopia.
500 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
502 There is new commentary about time in Poland in 1919.
504 Proper credit has been given to DST inventor George Vernon Hudson.
506 Commentary about time in Metlakatla, AK and Resolute, NU has been
507 improved, with a new source for the former.
509 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
512 Commentary about permanent Antarctic bases has been updated.
514 Several typos have been corrected. (Thanks to Tim Parenti for
515 contributing some of these fixes.)
517 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
518 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
519 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
520 (Thanks to a heads-up from Dirkjan Ochtman.)
522 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
523 have been removed. These obsolescent US Naval Observatory entries were no
524 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
527 Release 2014e - 2014-06-12 21:53:52 -0700
529 Changes affecting near-future time stamps
531 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
532 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
533 switch to standard time at 24:00 the last Thursday before Ramadan, and
534 back to DST at 00:00 the first Friday after Ramadan.
536 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
537 to Milamber Space Network.) Guess that from 2015 on Morocco will
538 temporarily switch to standard time at 03:00 the last Saturday before
539 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
541 Changes affecting past time stamps
543 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
544 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
545 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
546 in 1991. (Thanks to Hank W. for reporting the problems.)
548 Changes affecting commentary
550 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
551 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
552 removes stale pointers to World Time Explorer and WORLDTIME.
555 Release 2014d - 2014-05-27 21:34:40 -0700
557 Changes affecting code
559 zic no longer generates files containing time stamps before the Big Bang.
560 This works around GNOME bug 730332
561 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
562 (Thanks to Leonardo Chiquitto for reporting the bug, and to
563 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
565 Changes affecting documentation
567 tz-link.htm now mentions GNOME.
570 Release 2014c - 2014-05-13 07:44:13 -0700
572 Changes affecting near-future time stamps
574 Egypt observes DST starting 2014-05-15 at 24:00.
575 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
576 Details have not been announced, except that DST will not be observed
577 during Ramadan. Guess that DST will stop during the same Ramadan dates as
578 Morocco, and that Egypt's future spring and fall transitions will be the
579 same as 2010 when it last observed DST, namely April's last Friday at
580 00:00 to September's last Thursday at 23:00 standard time. Also, guess
581 that Ramadan transitions will be at 00:00 standard time.
583 Changes affecting code
585 zic now generates transitions for minimum time values, eliminating guesswork
586 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
588 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
590 Changes affecting commentary and documentation
592 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
595 Release 2014b - 2014-03-24 21:28:50 -0700
597 Changes affecting near-future time stamps
599 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
600 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
602 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
603 Bengt-Inge Larsson.) This is currently an approximation; a better version
604 will require the zic and localtime fixes mentioned below, and the plan is
605 to wait for a while until at least the zic fixes propagate.
607 Changes affecting code
609 'zic' and 'localtime' no longer reject locations needing four transitions
610 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
611 Also, 'zic' avoids some unlikely failures due to integer overflow.
613 Changes affecting build procedure
615 'make check' now detects Rule lines defined but never used.
616 The NZAQ rules, an instance of this problem, have been removed.
618 Changes affecting commentary and documentation
620 Fix Tuesday/Thursday typo in description of time in Israel.
621 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
623 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
624 to Donald MacQueen.) Instead, the Microsoft Windows Store app
625 library supports them.
627 Add comments about Johnston Island time in the 1960s.
628 (Thanks to Lyle McElhaney.)
630 Morocco's 2014 DST start will be as predicted.
631 (Thanks to Sebastien Willemijns.)
634 Release 2014a - 2014-03-07 23:30:29 -0800
636 Changes affecting near-future time stamps
638 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
639 the heads-up, and to Tim Parenti for simplifying the update.)
641 Changes affecting past time stamps
643 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
644 (Thanks to Steffen Thorsen.)
646 Ukraine switched from Moscow to Eastern European time on 1990-07-01
647 (not 1992-01-01), and observed DST during the entire next winter.
648 (Thanks to Vladimir in Moscow via Alois Treindl.)
650 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
651 (Thanks to Avigdor Finkelstein.)
653 Changes affecting code
655 A uninitialized-storage bug in 'localtime' has been fixed.
656 (Thanks to Logan Chien.)
658 Changes affecting the build procedure
660 The settings for 'make check_web' now default to Ubuntu 13.10.
662 Changes affecting commentary and documentation
664 The boundary of the US Pacific time zone is given more accurately.
665 (Thanks to Alan Mintz.)
667 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
669 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
671 Better descriptions of countries with same time zone history as
672 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
674 Several changes affect tz-link.htm, the main web page.
676 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
679 Mention xCal (Internet RFC 6321) and jCal.
681 Microsoft has some support for tz database names.
683 CLDR data formats include both XML and JSON.
685 Mention Maggiolo's map of solar vs standard time.
686 (Thanks to Arthur David Olson.)
688 Mention TZ4Net. (Thanks to Matt Johnson.)
690 Mention the timezone-olson Haskell package.
692 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
694 Remove moribund links to daylight-savings-time.info and to
695 Simple Timer + Clocks.
697 Update two links. (Thanks to Oscar van Vlijmen.)
699 Fix some formatting glitches, e.g., remove random newlines from
700 abbr elements' title attributes.
703 Release 2013i - 2013-12-17 07:25:23 -0800
705 Changes affecting near-future time stamps:
707 Jordan switches back to standard time at 00:00 on December 20, 2013.
708 The 2006-2011 transition schedule is planned to resume in 2014.
709 (Thanks to Steffen Thorsen.)
711 Changes affecting past time stamps:
713 In 2004, Cuba began DST on March 28, not April 4.
714 (Thanks to Steffen Thorsen.)
716 Changes affecting code
718 The compile-time flag NOSOLAR has been removed, as nowadays the
719 benefit of slightly shrinking runtime table size is outweighed by the
720 cost of disallowing potential future updates that exceed old limits.
722 Changes affecting documentation and commentary
724 The files solar87, solar88, and solar89 are no longer distributed.
725 They were a negative experiment - that is, a demonstration that
726 tz data can represent solar time only with some difficulty and error.
727 Their presence in the distribution caused confusion, as Riyadh
728 civil time was generally not solar time in those years.
730 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
733 Release 2013h - 2013-10-25 15:32:32 -0700
735 Changes affecting current and future time stamps:
737 Libya has switched its time zone back to UTC+2 without DST,
738 instead of UTC+1 with DST. (Thanks to Even Scharning.)
740 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
741 (Thanks to Gwillim Law.)
743 Changes affecting future time stamps:
745 Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5
746 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
747 (Thanks to Steffen Thorsen.)
749 Add entries for DST transitions in Morocco in the year 2038.
750 This avoids some year-2038 glitches introduced in 2013g.
751 (Thanks to Yoshito Umaoka for reporting the problem.)
753 Changes affecting API
755 The 'tzselect' command no longer requires the 'select' command,
756 and should now work with /bin/sh on more platforms. It also works
757 around a bug in BusyBox awk before version 1.21.0. (Thanks to
758 Patrick 'P. J.' McDermott and Alan Barrett.)
760 Changes affecting code
762 Fix localtime overflow bugs with 32-bit unsigned time_t.
764 zdump no longer assumes sscanf returns maximal values on overflow.
766 Changes affecting the build procedure
768 The builder can specify which programs to use, if any, instead of
769 'ar' and 'ranlib', and libtz.a is now built locally before being
770 installed. (Thanks to Michael Forney.)
772 A dependency typo in the 'zdump' rule has been fixed.
773 (Thanks to Andrew Paprocki.)
775 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
776 work as specified by POSIX.2-1992 or later; this is portable nowadays.
778 'make clean' no longer removes 'leapseconds', since it's
779 host-independent and is part of the distribution.
781 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
783 Changes affecting documentation and commentary
785 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
786 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
788 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
789 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
790 longer maintained) and for old advisories. SOFA now does C.
792 Release 2013g - 2013-09-30 21:08:26 -0700
794 Changes affecting current and near-future time stamps
796 Morocco now observes DST from the last Sunday in March to the last
797 Sunday in October, not April to September respectively. (Thanks
800 Changes affecting 'zic'
802 'zic' now runs on platforms that lack both hard links and symlinks.
803 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
804 Also, fix some bugs on platforms that lack hard links but have symlinks.
806 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
807 to predict the far future, fixing a bug introduced in 2013e.
809 Changes affecting the build procedure
811 The 'leapseconds' file is again put into the tzdata tarball.
812 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
813 Matt Burgess and Ian Abbott.) The timestamps of these and other
814 dependent files in tarballs are adjusted more consistently.
816 Changes affecting documentation and commentary
818 The README file is now part of the data tarball as well as the code.
819 It now states that files are public domain unless otherwise specified.
820 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
821 Its details about the 1989 release moved to a place of honor near
825 Release 2013f - 2013-09-24 23:37:36 -0700
827 Changes affecting near-future time stamps
829 Tocantins will very likely not observe DST starting this spring.
830 (Thanks to Steffen Thorsen.)
832 Jordan will likely stay at UTC+3 indefinitely, and will not fall
835 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
837 Changes affecting API
839 The types of the global variables 'timezone' and 'altzone' (if present)
840 have been changed back to 'long'. This is required for 'timezone'
841 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
842 These variables were originally 'long' in the tz code, but were
843 mistakenly changed to 'time_t' in 1987; nobody reported the
844 incompatibility until now. The difference matters on x32, where
845 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
847 Changes affecting the build procedure
849 Avoid long strings in leapseconds.awk to work around a mawk bug.
850 (Thanks to Cyril Baurand.)
852 Changes affecting documentation and commentary
854 New file 'NEWS' that contains release notes like this one.
856 Paraguay's law does not specify DST transition time; 00:00 is customary.
857 (Thanks to Waldemar Villamayor-Venialbo.)
859 Minor capitalization fixes.
861 Changes affecting version-control only
863 The experimental GitHub repository now contains annotated and
864 signed tags for recent releases, e.g., '2013e' for Release 2013e.
865 Releases are tagged starting with 2012e; earlier releases were
866 done differently, and tags would either not have a simple name or
867 not exactly match what was released.
869 'make set-timestamps' is now simpler and a bit more portable.
872 Release 2013e - 2013-09-19 23:50:04 -0700
874 Changes affecting near-future time stamps
876 This year Fiji will start DST on October 27, not October 20.
877 (Thanks to David Wheeler for the heads-up.) For now, guess that
878 Fiji will continue to spring forward the Sunday before the fourth
881 Changes affecting current and future time zone abbreviations
883 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
884 time zone abbreviations since 1932. (Thanks to George Ziegler,
885 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
886 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
887 Asia/Makassar, and Asia/Pontianak.
889 Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but
890 daylight saving time) for San Luis, Argentina since 2009.
892 Changes affecting Godthåb time stamps after 2037 if version mismatch
894 Allow POSIX-like TZ strings where the transition time's hour can
895 range from -167 through 167, instead of the POSIX-required 0
896 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
897 new Fiji rules. This is a more-compact way to represent
898 far-future time stamps for America/Godthab, America/Santiago,
899 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
900 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
901 this change. (Derived from a suggestion by Arthur David Olson.)
903 Allow POSIX-like TZ strings where daylight saving time is in
904 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
905 Argentina Summer Time all year. This supports a more-compact way
906 to represent the 2013d data for America/Argentina/San_Luis.
907 Because of the change for San Luis noted above this change does not
908 affect the current data. (Thanks to Andrew Main (Zefram) for
909 suggestions that improved this change.)
911 Where these two TZ changes take effect, there is a minor extension
912 to the tz file format in that it allows new values for the
913 embedded TZ-format string, and the tz file format version number
914 has therefore been increased from 2 to 3 as a precaution.
915 Version-2-based client code should continue to work as before for
916 all time stamps before 2038. Existing version-2-based client code
917 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
918 files, and typically works in practice even for time stamps after
919 2037; the only known exception is America/Godthab.
921 Changes affecting time stamps before 1970
923 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
924 some errors before 1947.
926 Some zones have been turned into links, when they differ from existing
927 zones only in older data entries that were likely invented or that
928 differ only in LMT or transitions from LMT. These changes affect
929 only time stamps before 1943. The affected zones are:
930 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
931 America/Grenada, America/Guadeloupe, America/Marigot,
932 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
933 America/St_Lucia, America/St_Thomas, America/St_Vincent,
934 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
935 confirming that the old Europe/Vaduz zone was wrong and the new
936 link is better for WWII-era times.)
938 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
939 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
942 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
943 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
946 Change the date of the circa-1850 Zurich transition from 1849-09-12
947 to 1853-07-16, overriding Shanks with data from Messerli about
948 postal and telegraph time in Switzerland.
950 Changes affecting time zone abbreviations before 1970
952 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
953 as Jakarta was called Batavia back then.
955 Changes affecting API
957 The 'zic' command now outputs a dummy transition when far-future
958 data can't be summarized using a TZ string, and uses a 402-year
959 window rather than a 400-year window. For the current data, this
960 affects only the Asia/Tehran file. It does not affect any of the
961 time stamps that this file represents, so zdump outputs the same
962 information as before. (Thanks to Andrew Main (Zefram).)
964 The 'date' command has a new '-r' option, which lets you specify
965 the integer time to display, a la FreeBSD.
967 The 'tzselect' command has two new options '-c' and '-n', which lets you
968 select a zone based on latitude and longitude.
970 The 'zic' command's '-v' option now warns about constructs that
971 require the new version-3 binary file format. (Thanks to Arthur
972 David Olson for the suggestion.)
974 Support for floating-point time_t has been removed.
975 It was always dicey, and POSIX no longer requires it.
976 (Thanks to Eric Blake for suggesting to the POSIX committee to
977 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
978 Heninger, Arthur David Olson, and Alois Treindl, for reporting
979 bugs and elucidating some of the corners of the old floating-point
982 The signatures of 'offtime', 'timeoff', and 'gtime' have been
983 changed back to the old practice of using 'long' to represent UT
984 offsets. This had been inadvertently and mistakenly changed to
985 'int_fast32_t'. (Thanks to Christos Zoulas.)
987 The code avoids undefined behavior on integer overflow in some
988 more places, including gmtime, localtime, mktime and zdump.
990 Changes affecting the zdump utility
992 zdump now outputs "UT" when referring to Universal Time, not "UTC".
993 "UTC" does not make sense for time stamps that predate the introduction
994 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
995 for clarifying UT vs UTC.)
997 Data changes affecting behavior of tzselect and similar programs
999 Country code BQ is now called the more-common name "Caribbean Netherlands"
1000 rather than the more-official "Bonaire, St Eustatius & Saba".
1002 Remove from zone.tab the names America/Montreal, America/Shiprock,
1003 and Antarctica/South_Pole, as they are equivalent to existing
1004 same-country-code zones for post-1970 time stamps. The data entries for
1005 these names are unchanged, so the names continue to work as before.
1007 Changes affecting code internals
1009 zic -c now runs way faster on 64-bit hosts when given large numbers.
1011 zic now uses vfprintf to avoid allocating and freeing some memory.
1013 tzselect now computes the list of continents from the data,
1014 rather than have it hard-coded.
1016 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1018 Changes affecting the build procedure
1020 The 'leapseconds' file is now generated automatically from a
1021 new file 'leap-seconds.list', which is a copy of
1022 <ftp://time.nist.gov/pub/leap-seconds.list>.
1023 A new source file 'leapseconds.awk' implements this.
1024 The goal is simplification of the future maintenance of 'leapseconds'.
1026 When building the 'posix' or 'right' subdirectories, if the
1027 subdirectory would be a copy of the default subdirectory, it is
1028 now made a symbolic link if that is supported. This saves about
1029 2 MB of file system space.
1031 The links America/Shiprock and Antarctica/South_Pole have been
1032 moved to the 'backward' file. This affects only nondefault builds
1033 that omit 'backward'.
1035 Changes affecting version-control only
1037 .gitignore now ignores 'date'.
1039 Changes affecting documentation and commentary
1041 Changes to the 'tzfile' man page
1043 It now mentions that the binary file format may be extended in
1044 future versions by appending data.
1046 It now refers to the 'zdump' and 'zic' man pages.
1048 Changes to the 'zic' man page
1050 It lists conditions that elicit a warning with '-v'.
1052 It says that the behavior is unspecified when duplicate names
1053 are given, or if the source of one link is the target of another.
1055 Its examples are updated to match the latest data.
1057 The definition of white space has been clarified slightly.
1058 (Thanks to Michael Deckers.)
1060 Changes to the 'Theory' file
1062 There is a new section about the accuracy of the tz database,
1063 describing the many ways that errors can creep in, and
1064 explaining why so many of the pre-1970 time stamps are wrong or
1065 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1066 Wollman for discussions that contributed to this).
1068 The 'Theory' file describes LMT better (this follows a
1069 suggestion by Guy Harris).
1071 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1073 It's mentioned that excluding 'backward' should not affect the
1074 other data, and it suggests at least one zone.tab name per
1075 inhabited country (thanks to Stephen Colebourne).
1077 Some longstanding restrictions on names are documented, e.g.,
1078 'America/New_York' precludes 'America/New_York/Bronx'.
1080 It gives more reasons for the 1970 cutoff.
1082 It now mentions which time_t variants are supported, such as
1083 signed integer time_t. (Thanks to Paul Goyette for reporting
1084 typos in an experimental version of this change.)
1086 (Thanks to Philip Newton for correcting typos in these changes.)
1088 Documentation and commentary is more careful to distinguish UT in
1089 general from UTC in particular. (Thanks to Steve Allen.)
1091 Add a better source for the Zurich 1894 transition.
1092 (Thanks to Pierre-Yves Berger.)
1094 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1097 Release 2013d - 2013-07-05 07:38:01 -0700
1099 Changes affecting future time stamps:
1101 Morocco's midsummer transitions this year are July 7 and August 10,
1102 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1104 Israel now falls back on the last Sunday of October.
1105 (Thanks to Ephraim Silverberg.)
1107 Changes affecting past time stamps:
1109 Specify Jerusalem's location more precisely; this changes the pre-1880
1112 Changing affecting metadata only:
1114 Fix typos in the entries for country codes BQ and SX.
1116 Changes affecting code:
1118 Rework the code to fix a bug with handling Australia/Macquarie on
1119 32-bit hosts (thanks to Arthur David Olson).
1121 Port to platforms like NetBSD, where time_t can be wider than long.
1123 Add support for testing time_t types other than the system's.
1124 Run 'make check_time_t_alternatives' to try this out.
1125 Currently, the tests fail for unsigned time_t;
1126 this should get fixed at some point.
1128 Changes affecting documentation and commentary:
1130 Deemphasize the significance of national borders.
1132 Update the zdump man page.
1134 Remove obsolete NOID comment (thanks to Denis Excoffier).
1136 Update several URLs and comments in the web pages.
1138 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1140 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1143 Release 2013c - 2013-04-19 16:17:40 -0700
1145 Changes affecting current and future time stamps:
1147 Palestine observed DST starting March 29, 2013. (Thanks to
1148 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1149 with the predicted rules being the last Thursday in March at 24:00
1150 to the first Friday on or after September 21 at 01:00.
1152 Assume that the recent change to Paraguay's DST rules is permanent,
1153 by moving the end of DST to the 4th Sunday in March every year.
1154 (Thanks to Carlos Raúl Perasso.)
1156 Changes affecting past time stamps:
1158 Fix some historical data for Palestine to agree with that of
1159 timeanddate.com, as follows:
1161 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1164 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1167 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1169 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1171 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1173 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1175 Fix times of habitation for Macquarie to agree with the Tasmania
1176 Parks & Wildlife Service history, which indicates that permanent
1177 habitation was 1899-1919 and 1948 on.
1179 Changing affecting metadata only:
1181 Macquarie Island is politically part of Australia, not Antarctica.
1182 (Thanks to Tobias Conradi.)
1184 Sort Macquarie more-consistently with other parts of Australia.
1185 (Thanks to Tim Parenti.)
1188 Release 2013b - 2013-03-10 22:33:40 -0700
1190 Changes affecting current and future time stamps:
1192 Haiti uses US daylight-saving rules this year, and presumably future years.
1193 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1195 Paraguay will end DST on March 24 this year.
1196 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1198 Morocco does not observe DST during Ramadan;
1199 try to predict Ramadan in Morocco as best we can.
1200 (Thanks to Erik Homoet for the heads-up.)
1202 Changes affecting commentary:
1204 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
1205 Update URL for Solaris. Mention Internet RFC 6557.
1206 Update Internet RFCs 2445->5545, 2822->5322.
1207 Switch from FTP to HTTP for Internet RFCs.
1210 Release 2013a - 2013-02-27 09:20:35 -0800
1212 Change affecting binary data format:
1214 The zone offset at the end of version-2-format zone files is now
1215 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
1217 Changes affecting current and future time stamps:
1219 Chile's 2013 rules, and we guess rules for 2014 and later, will be
1220 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1221 (Thanks to Steffen Thorsen and Robert Elz.)
1223 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1224 (Thanks to Tobias Conradi and Arthur David Olson.)
1226 Many changes affect historical time stamps before 1940.
1227 These were deduced from: Milne J. Civil time. Geogr J. 1899
1228 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1230 Changes affecting the code:
1232 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1233 the data). (Thanks to Arthur David Olson.)
1235 Fix localtime bug when time_t is unsigned and data files were generated
1236 by a signed time_t system. (Thanks to Doug Bailey for reporting and
1237 to Arthur David Olson for fixing.)
1239 Allow the email address for bug reports to be set by the packager.
1240 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
1242 Update HTML checking to be compatible with Ubuntu 12.10.
1244 Check that files are a safe subset of ASCII. At some point we may
1245 relax this requirement to a safe subset of UTF-8. Without the
1246 check, some non-UTF-8 encodings were leaking into the distribution.
1250 Restore a comment about copyright notices that was inadvertently deleted.
1251 (Thanks to Arthur David Olson.)
1253 Improve the commentary about which districts observe what times
1254 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
1256 Add web page links to tz.js.
1258 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
1261 Release 2012j - 2012-11-12 18:34:49 -0800
1263 Libya moved to CET this weekend, but with DST planned next year.
1264 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
1266 Signatures now have the extension .asc, not .sign, as that's more
1267 standard. (Thanks to Phil Pennock.)
1269 The output of 'zdump --version', and of 'zic --version', now
1270 uses a format that is more typical for --version.
1271 (Thanks to Joseph S. Myers.)
1273 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
1274 now uses tz@iana.org rather than the old elsie address.
1276 zic -v now complains about abbreviations that are less than 3
1277 or more than 6 characters, as per Posix. Formerly, it checked
1278 for abbreviations that were more than 3.
1280 'make public' no longer puts its temporary directory under /tmp,
1281 and uses the just-built zic rather than the system zic.
1283 Various fixes to documentation and commentary.
1286 Release 2012i - 2012-11-03 12:57:09 -0700
1288 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
1290 Linker flags can now be specified via LDFLAGS.
1291 AWK now defaults to 'awk', not 'nawk'.
1292 The shell in tzselect now defaults to /bin/bash, but this can
1293 be overridden by specifying KSHELL.
1294 The main web page now mentions the unofficial GitHub repository.
1295 (Thanks to Mike Frysinger.)
1297 Tarball signatures can now be built by running 'make signatures'.
1298 There are also new makefile rules 'tarballs', 'check_public', and
1299 separate makefile rules for each tarball and signature file.
1300 A few makefile rules are now more portable to strict POSIX.
1302 The main web page now lists the canonical IANA URL.
1305 Release 2012h - 2012-10-26 22:49:10 -0700
1307 Bahia no longer has DST. (Thanks to Kelley Cook.)
1309 Tocantins has DST. (Thanks to Rodrigo Severo.)
1311 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
1313 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
1317 More C modernization, except that at Arthur David Olson's suggestion
1318 the instances of 'register' were kept.
1321 Release 2012g - 2012-10-17 20:59:45 -0700
1323 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
1325 Palestine fall 2012. (Thanks to Steffen Thorsen.)
1329 To attack the version-number problem, this release ships the file
1330 'Makefile' (which contains the release number) in both the tzcode and
1331 the tzdata tarballs. The two Makefiles are identical, and should be
1332 identical in any matching pair of tarballs, so it shouldn't matter
1333 which order you extract the tarballs. Perhaps we can come up with a
1334 better version-number scheme at some point; this scheme does have the
1335 virtue of not adding more files.
1338 Release 2012f - 2012-09-12 23:17:03 -0700
1340 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
1341 20 this year. (Thanks to Steffen Thorsen.)
1344 Release 2012e - 2012-08-02 20:44:55 -0700
1346 * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14.
1347 (Thanks to Steffen Thorsen.)
1349 * Use a single version number for both code and data.
1351 * .gitignore: New file.
1353 * Remove trailing white space.
1356 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
1358 Changes for Morocco's time stamps, which take effect in a couple of
1359 hours, along with infrastructure changes to accommodate how the tz
1360 code and data are released on IANA.
1363 Release data2012c - 2012-03-27 12:17:25 -0400
1366 Summer time changes for Morocco (to start late April 2012)
1369 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
1372 Haiti following US/Canada rules for 2012 (and we're assuming,
1373 for now anyway, for the future).
1376 Release 2012b - 2012-03-02 12:29:15 +0700
1378 There is just one change to tzcode2012b (compared with 2012a):
1379 the Makefile that was accidentally included with 2012a has been
1380 replaced with the version that should have been there, which is
1381 identical with the previous version (from tzcode2011i).
1383 There are just two changes in tzdata2012b compared with 2012a.
1385 Most significantly, summer time in Cuba has been delayed 3 weeks
1386 (now starts April 1 rather than March 11). Since Mar 11 (the old start
1387 date, as listed in 2012a) is just a little over a week away, this
1390 Less importantly, an excess tab in one of the changes in zone.tab
1391 in 2012a has been removed.
1394 Release 2012a - 2012-03-01 18:28:10 +0700
1396 The changes in tzcode2012a (compared to the previous version, 2011i)
1397 are entirely to the README and tz-art.htm and tz-link.htm files, if
1398 none of those concern you, you can ignore the code update. The changes
1399 reflect the changed addresses for the mailing list and the code and
1400 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
1401 has been added to tz-link.htm).
1403 In tzdata2012a (compared to the previous release, which was 2011n)
1404 the major changes are:
1405 Chile 2011/2012 and 2012/2013 summer time date adjustments.
1406 Falkland Islands onto permanent summer time (we're assuming for the
1407 foreseeable future, though 2012 is all we're fairly certain of.)
1408 Armenia has abolished Summer Time.
1409 Tokelau jumped the International Date Line back last December
1410 (just the same as their near neighbour, Samoa).
1411 America/Creston is a new zone for a small area of British Columbia
1412 There will be a leapsecond 2012-06-30 23:59:60 UTC.
1414 Other minor changes are:
1415 Corrections to 1918 Canadian summer time end dates.
1416 Updated URL for UK time zone history (in comments)
1417 A few typos in Le Corre's list of free French place names (comments)
1420 Release data2011n - 2011-10-30 14:57:54 +0700
1422 There are three changes of note - most urgently, Cuba (America/Havana)
1423 has extended summer time by two weeks, now to end on Nov 13, rather than
1424 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
1425 (Europe/Tiraspol) decided not to split from the rest of Moldova after
1426 all, and consequently that zone has been removed (again) and reinstated
1427 in the "backward" file as a link to Europe/Chisinau. And third, the
1428 end date for Fiji's summer time this summer was moved forward from the
1429 earlier planned Feb 26, to Jan 22.
1431 Apart from that, Moldova (MD) returns to a single entry in zone.tab
1432 (and the incorrect syntax that was in the 2011m version of that file
1433 is so fixed - it would have been fixed in a different way had this
1434 change not happened - that's the "missing" sccs version id).
1437 Release data2011m - 2011-10-24 21:42:16 +0700
1439 In particular, the typos in comments in the data (2011-11-17 should have
1440 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
1441 Tim Parenti noted) have been fixed, and the change for Ukraine has been
1442 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
1443 Tim Parenti, and also Denys Gavrysh)
1445 In addition, I added Europe/Tiraspol to zone.tab.
1447 This time, all the files have new version numbers... (including the files
1448 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
1449 version numbers there...)
1452 Release data2011l - 2011-10-10 11:15:43 +0700
1454 There are just 2 changes that cause different generated tzdata files from
1455 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
1456 is included, but commented out. Compared with the diff I sent out last week,
1457 this version also includes attributions for the sources for the changes
1458 (in much the same format as ado used, but the html tags have not been
1459 checked, verified, or used in any way at all, so if there are errors there,
1460 please let me know.)
1463 Release data2011k - 2011-09-20 17:54:03 -0400
1468 Release data2011j - 2011-09-12 09:22:49 -0400
1470 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
1471 Tanzania); there are also two spelling corrections to comments in
1472 the australasia file (with thanks to Christos Zoulas).
1475 Release 2011i - 2011-08-29 05:56:32 -0400
1480 Release data2011h - 2011-06-15 18:41:48 -0400
1482 Russia and Curaçao changes
1485 Release 2011g - 2011-04-25 09:07:22 -0400
1487 update the rules for Egypt to reflect its abandonment of DST this year
1490 Release 2011f - 2011-04-06 17:14:53 -0400
1495 Release 2011e - 2011-03-31 16:04:38 -0400
1497 Morocco, Chile, and tz-link changes
1500 Release 2011d - 2011-03-14 09:18:01 -0400
1502 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
1505 Release 2011c - 2011-03-07 09:30:09 -0500
1507 These do affect current time stamps in Chile and Annette Island, Canada.
1510 Release 2011b - 2011-02-07 08:44:50 -0500
1515 Release 2011a - 2011-01-24 10:30:16 -0500
1520 Release data2010o - 2010-11-01 09:18:23 -0400
1522 change to the end of DST in Fiji in 2011
1525 Release 2010n - 2010-10-25 08:19:17 -0400
1530 Release 2010m - 2010-09-27 09:24:48 -0400
1532 Hong Kong, Vostok, and zic.c changes
1535 Release 2010l - 2010-08-16 06:57:25 -0400
1540 Release 2010k - 2010-07-26 10:42:27 -0400
1545 Release 2010j - 2010-05-10 09:07:48 -0400
1547 changes for Bahía de Banderas and for version naming
1550 Release data2010i - 2010-04-16 18:50:45 -0400
1552 the end of DST in Morocco on 2010-08-08
1555 Release data2010h - 2010-04-05 09:58:56 -0400
1560 Release data2010g - 2010-03-24 11:14:53 -0400
1565 Release 2010f - 2010-03-22 09:45:46 -0400
1570 Release data2010e - 2010-03-08 14:24:27 -0500
1572 corrects the Dhaka bug found by Danvin Ruangchan
1575 Release data2010d - 2010-03-06 07:26:01 -0500
1580 Release 2010c - 2010-03-01 09:20:58 -0500
1582 changes including KRE's suggestion for earlier initialization of
1583 "goahead" and "goback" structure elements
1586 Release code2010a - 2010-02-16 10:40:04 -0500
1591 Release data2010b - 2010-01-20 12:37:01 -0500
1596 Release data2010a - 2010-01-18 08:30:04 -0500
1601 Release data2009u - 2009-12-26 08:32:28 -0500
1603 changes to DST in Bangladesh
1606 Release 2009t - 2009-12-21 13:24:27 -0500
1611 Release data2009s - 2009-11-14 10:26:32 -0500
1613 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
1616 Release 2009r - 2009-11-09 10:10:31 -0500
1618 "antarctica" and "tz-link.htm" changes
1621 Release 2009q - 2009-11-02 09:12:40 -0500
1623 with two corrections as reported by Eric Muller and Philip Newton
1626 Release data2009p - 2009-10-23 15:05:27 -0400
1628 Argentina (including San Luis) changes (with the correction from
1632 Release data2009o - 2009-10-14 16:49:38 -0400
1634 Samoa (commentary only), Pakistan, and Bangladesh changes
1637 Release data2009n - 2009-09-22 15:13:38 -0400
1639 added commentary for Argentina and a change to the end of DST in
1643 Release data2009m - 2009-09-03 10:23:43 -0400
1645 Samoa and Palestine changes
1648 Release data2009l - 2009-08-14 09:13:07 -0400
1650 Samoa (comments only) and Egypt
1653 Release 2009k - 2009-07-20 09:46:08 -0400
1658 Release data2009j - 2009-06-15 06:43:59 -0400
1660 Bangladesh change (with a short turnaround since the DST change is
1664 Release 2009i - 2009-06-08 09:21:22 -0400
1666 updating for DST in Bangladesh this year
1669 Release 2009h - 2009-05-26 09:19:14 -0400
1674 Release data2009g - 2009-04-20 16:34:07 -0400
1679 Release data2009f - 2009-04-10 11:00:52 -0400
1681 correct DST in Pakistan
1684 Release 2009e - 2009-04-06 09:08:11 -0400
1689 Release 2009d - 2009-03-23 09:38:12 -0400
1691 Morocco, Tunisia, Argentina, and American Astronomical Society changes
1694 Release data2009c - 2009-03-16 09:47:51 -0400
1696 change to the start of Cuban DST
1699 Release 2009b - 2009-02-09 11:15:22 -0500
1704 Release 2009a - 2009-01-21 10:09:39 -0500
1709 Release data2008i - 2008-10-21 12:10:25 -0400
1711 southamerica and zone.tab files, with Argentina DST rule changes and
1712 United States zone reordering and recommenting
1715 Release 2008h - 2008-10-13 07:33:56 -0400
1720 Release 2008g - 2008-10-06 09:03:18 -0400
1722 Fix a broken HTML anchor and update Brazil's DST transitions;
1723 there's also a slight reordering of information in tz-art.htm.
1726 Release data2008f - 2008-09-09 22:33:26 -0400
1731 Release 2008e - 2008-07-28 14:11:17 -0400
1733 changes by Arthur David Olson and Jesper Nørgaard Welen
1736 Release data2008d - 2008-07-07 09:51:38 -0400
1738 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
1741 Release data2008c - 2008-05-19 17:48:03 -0400
1743 Pakistan, Morocco, and Mongolia
1746 Release data2008b - 2008-03-24 08:30:59 -0400
1748 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
1752 Release 2008a - 2008-03-08 05:42:16 -0500
1757 Release 2007k - 2007-12-31 10:25:22 -0500
1759 most importantly, changes to the "southamerica" file based on
1760 Argentina's readoption of daylight saving time
1763 Release 2007j - 2007-12-03 09:51:01 -0500
1765 1. eliminate the "P" (parameter) macro;
1767 2. the "noncontroversial" changes circulated on the time zone
1768 mailing list (less the changes to "logwtmp.c");
1770 3. eliminate "too many transition" errors when "min" is used in time
1773 4. changes by Paul Eggert (including updated information for Venezuela).
1776 Release data2007i - 2007-10-30 10:28:11 -0400
1778 changes for Cuba and Syria
1781 Release 2007h - 2007-10-01 10:05:51 -0400
1783 changes by Paul Eggert, as well as an updated link to the ICU
1784 project in tz-link.htm
1787 Release 2007g - 2007-08-20 10:47:59 -0400
1789 changes by Paul Eggert
1791 The "leapseconds" file has been updated to incorporate the most
1792 recent International Earth Rotation and Reference Systems Service
1795 There's an addition to tz-art.htm regarding the television show "Medium".
1798 Release 2007f - 2007-05-07 10:46:46 -0400
1800 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
1803 changes to zic.c to allow hour values greater than 24 (along with
1804 Paul's improved time value overflow checking)
1807 Release 2007e - 2007-04-02 10:11:52 -0400
1809 Syria and Honduras changes by Paul Eggert
1811 zic.c variable renaming changes by Arthur David Olson
1814 Release 2007d - 2007-03-20 08:48:30 -0400
1816 changes by Paul Eggert
1818 the elimination of white space at the ends of lines
1821 Release 2007c - 2007-02-26 09:09:37 -0500
1823 changes by Paul Eggert
1826 Release 2007b - 2007-02-12 09:34:20 -0500
1828 Paul Eggert's proposed change to the quotation handling logic in zic.c.
1830 changes to the commentary in "leapseconds" reflecting the IERS
1831 announcement that there is to be no positive leap second at the end
1835 Release 2007a - 2007-01-08 12:28:29 -0500
1837 changes by Paul Eggert
1839 Derick Rethan's Asmara change
1841 Oscar van Vlijmen's Easter Island local mean time change
1843 symbolic link changes
1846 Release 2006p - 2006-11-27 08:54:27 -0500
1848 changes by Paul Eggert
1851 Release 2006o - 2006-11-06 09:18:07 -0500
1853 changes by Paul Eggert
1856 Release 2006n - 2006-10-10 11:32:06 -0400
1858 changes by Paul Eggert
1861 Release 2006m - 2006-10-02 15:32:35 -0400
1863 changes for Uruguay, Palestine, and Egypt by Paul Eggert
1865 (minimalist) changes to zic.8 to clarify "until" information
1868 Release data2006l - 2006-09-18 12:58:11 -0400
1870 Paul's best-effort work on this coming weekend's Egypt time change
1873 Release 2006k - 2006-08-28 12:19:09 -0400
1875 changes by Paul Eggert
1878 Release 2006j - 2006-08-21 09:56:32 -0400
1880 changes by Paul Eggert
1883 Release code2006i - 2006-08-07 12:30:55 -0400
1887 Ken Pizzini's conversion script
1890 Release code2006h - 2006-07-24 09:19:37 -0400
1892 adds public domain notices to four files
1894 includes a fix for transition times being off by a second
1896 adds a new recording to the "arts" file (information courtesy Colin Bowern)
1899 Release 2006g - 2006-05-08 17:18:09 -0400
1901 northamerica changes by Paul Eggert
1904 Release 2006f - 2006-05-01 11:46:00 -0400
1906 a missing version number problem is fixed (with thanks to Bradley
1907 White for catching the problem)
1910 Release 2006d - 2006-04-17 14:33:43 -0400
1912 changes by Paul Eggert
1914 added new items to tz-arts.htm that were found by Paul
1917 Release 2006c - 2006-04-03 10:09:32 -0400
1919 two sets of data changes by Paul Eggert
1921 a fencepost error fix in zic.c
1923 changes to zic.c and the "europe" file to minimize differences
1924 between output produced by the old 32-bit zic and the new 64-bit
1928 Release 2006b - 2006-02-20 10:08:18 -0500
1929 [tz32code2006b + tz64code2006b + tzdata2006b]
1933 All SCCS IDs were bumped to "8.1" for this release.
1936 Release 2006a - 2006-01-30 08:59:31 -0500
1938 changes by Paul Eggert (in particular, Indiana time zone moves)
1940 an addition to the zic manual page to describe how special-case
1941 transitions are handled
1944 Release 2005r - 2005-12-27 09:27:13 -0500
1946 Canadian changes by Paul Eggert
1948 They also add "<pre>" directives to time zone data files and reflect
1949 changes to warning message logic in "zdump.c" (but with calls to
1950 "gettext" kept unbundled at the suggestion of Ken Pizzini).
1953 Release 2005q - 2005-12-13 09:17:09 -0500
1955 Nothing earth-shaking here:
1956 1. Electronic mail addresses have been removed.
1957 2. Casts of the return value of exit have been removed.
1958 3. Casts of the argument of is.* macros have been added.
1959 4. Indentation in one section of zic.c has been fixed.
1960 5. References to dead URLs in the data files have been dealt with.
1963 Release 2005p - 2005-12-05 10:30:53 -0500
1965 "systemv", "tz-link.htm", and "zdump.c" changes
1966 (less the casts of arguments to the is* macros)
1969 Release 2005o - 2005-11-28 10:55:26 -0500
1971 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
1973 zdump.c lint fixes by Arthur David Olson
1976 Release 2005n - 2005-10-03 09:44:09 -0400
1978 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
1982 Release 2005m - 2005-08-29 12:15:40 -0400
1984 changes by Paul Eggert (with a small tweak to the tz-art change)
1986 a declaration of an unused variable has been removed from zdump.c
1989 Release 2005l - 2005-08-22 12:06:39 -0400
1991 changes by Paul Eggert
1993 overflow/underflow checks by Arthur David Olson, minus changes to
1994 the "Theory" file about the pending addition of 64-bit data (I grow
1995 less confident of the changes being accepted with each passing day,
1996 and the changes no longer increase the data files nine-fold--there's
1997 less than a doubling in size by my local Sun's reckoning)
2000 Release 2005k - 2005-07-14 14:14:24 -0400
2002 The "leapseconds" file has been edited to reflect the recently
2003 announced leap second at the end of 2005.
2005 I've also deleted electronic mail addresses from the files as an
2009 Release 2005j - 2005-06-13 14:34:13 -0400
2011 These reflect changes to limit the length of time zone abbreviations
2012 and the characters used in those abbreviations.
2014 There are also changes to handle POSIX-style "quoted" time zone
2015 environment variables.
2017 The changes were circulated on the time zone mailing list; the only
2018 change since then was the removal of a couple of minimum-length of
2019 abbreviation checks.
2022 Release data2005i - 2005-04-21 15:04:16 -0400
2024 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2027 Release 2005h - 2005-04-04 11:24:47 -0400
2029 changes by Paul Eggert
2031 minor changes to Makefile and zdump.c to produce more useful output
2032 when doing a "make typecheck"
2035 Release 2005g - 2005-03-14 10:11:21 -0500
2037 changes by Paul Eggert (a change to current DST rules in Uruguay and
2038 an update to a link to time zone software)
2041 Release 2005f - 2005-03-01 08:45:32 -0500
2043 data and documentation changes by Paul Eggert
2046 Release 2005e - 2005-02-10 15:59:44 -0500
2051 Release code2005d - 2005-01-31 09:21:47 -0500
2053 make zic complain about links to links if the -v flag is used
2055 have "make public" do more code checking
2057 add an include to "localtime.c" for the benefit of gcc systems
2060 Release 2005c - 2005-01-17 18:36:29 -0500
2062 get better results when mktime runs on a system where time_t is double
2064 changes to the data files (most importantly to Paraguay)
2067 Release 2005b - 2005-01-10 09:19:54 -0500
2069 Get localtime and gmtime working on systems with exotic time_t types.
2071 Update the leap second commentary in the "leapseconds" file.
2074 Release 2005a - 2005-01-01 13:13:44 -0500
2079 Release code2004i - 2004-12-14 13:42:58 -0500
2081 Deal with systems where time_t is unsigned.
2084 Release code2004h - 2004-12-07 11:40:18 -0500
2086 64-bit-time_t changes
2089 Release 2004g - 2004-11-02 09:06:01 -0500
2091 update to Cuba (taking effect this weekend)
2093 other changes by Paul Eggert
2095 correction of the spelling of Oslo
2097 changed versions of difftime.c and private.h
2100 Release code2004f - 2004-10-21 10:25:22 -0400
2102 Cope with wide-ranging tm_year values.
2105 Release 2004e - 2004-10-11 14:47:21 -0400
2107 Brazil/Argentina/Israel changes by Paul Eggert
2109 changes to tz-link.htm by Paul
2111 one small fix to Makefile
2114 Release 2004d - 2004-09-22 08:27:29 -0400
2116 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2119 Release 2004c - 2004-08-11 12:06:26 -0400
2121 asctime-related changes
2123 (variants of) some of the documentation changes suggested by Paul Eggert
2126 Release 2004b - 2004-07-19 14:33:35 -0400
2128 data changes by Paul Eggert - most importantly, updates for Argentina
2131 Release 2004a - 2004-05-27 12:00:47 -0400
2133 changes by Paul Eggert
2135 Handle DST transitions that occur at the end of a month in some
2136 years but at the start of the following month in other years.
2138 Add a copy of the correspondence that's the basis for claims about
2139 DST in the Navajo Nation.
2142 Release 2003e - 2003-12-15 09:36:47 -0500
2144 changes by Arthur David Olson (primarily code changes)
2146 changes by Paul Eggert (primarily data changes)
2148 minor changes to "Makefile" and "northamerica" (in the latter case,
2149 optimization of the "Toronto" rules)
2152 Release 2003d - 2003-10-06 09:34:44 -0400
2154 changes by Paul Eggert
2157 Release 2003c - 2003-09-16 10:47:05 -0400
2159 Fix bad returns in zic.c's inleap function.
2160 Thanks to Bradley White for catching the problem!
2163 Release 2003b - 2003-09-16 07:13:44 -0400
2165 Add a "--version" option (and documentation) to the zic and zdump commands.
2167 changes to overflow/underflow checking in zic
2169 a localtime typo fix.
2171 Update the leapseconds and tz-art.htm files.
2174 Release 2003a - 2003-03-24 09:30:54 -0500
2176 changes by Paul Eggert
2178 a few additions and modifications to the tz-art.htm file
2181 Release 2002d - 2002-10-15 13:12:42 -0400
2183 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2185 There's also a new time zone quote in "tz-art.htm".
2188 Release 2002c - 2002-04-04 11:55:20 -0500
2190 changes by Paul Eggert
2192 Change zic.c to avoid creating symlinks to files that don't exist.
2195 Release 2002b - 2002-01-28 12:56:03 -0500
2197 [These change notes are for Release 2002a, which was corrupted.
2198 2002b was a corrected version of 2002a.]
2200 changes by Paul Eggert
2202 Update the "leapseconds" file to note that there'll be no leap
2203 second at the end of June, 2002.
2205 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2207 Change to "difftime.c" to avoid sizeof problems.
2210 Release 2001d - 2001-10-09 13:31:32 -0400
2212 changes by Paul Eggert
2215 Release 2001c - 2001-06-05 13:59:55 -0400
2217 changes by Paul Eggert and Andrew Brown
2220 Release 2001b - 2001-04-05 16:44:38 -0400
2222 changes by Paul Eggert (modulo jnorgard's typo fix)
2224 tz-art.htm has been HTMLified.
2227 Release 2001a - 2001-03-13 12:57:44 -0500
2229 changes by Paul Eggert
2231 An addition to the "leapseconds" file: comments with the text of the
2232 latest IERS leap second notice.
2234 Trailing white space has been removed from data file lines, and
2235 repeated spaces in "Rule Jordan" lines in the "asia" file have been
2239 Release 2000h - 2000-12-14 15:33:38 -0500
2241 changes by Paul Eggert
2243 one typo fix in the "art" file
2245 With providence, this is the last update of the millennium.
2248 Release 2000g - 2000-10-10 11:35:22 -0400
2250 changes by Paul Eggert
2252 correction of John Mackin's name submitted by Robert Elz
2254 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2255 Emmy Awards broadcast.
2258 Release 2000f - 2000-08-10 09:31:58 -0400
2260 changes by Paul Eggert
2262 Added information in "tz-art.htm" on a Seinfeld reference to DST.
2264 Error checking and messages in the "yearistype" script have been
2268 Release 2000e - 2000-07-31 09:27:54 -0400
2270 data changes by Paul Eggert
2272 a change to the default value of the defined constant HAVE_STRERROR
2274 the addition of a Dave Barry quote on DST to the tz-arts file
2277 Release 2000d - 2000-04-20 15:43:04 -0400
2279 changes to the documentation and code of strftime for C99 conformance
2281 a bug fix for date.c
2283 These are based on (though modified from) changes by Paul Eggert.
2286 Release 2000c - 2000-03-04 10:31:43 -0500
2288 changes by Paul Eggert
2291 Release 2000b - 2000-02-21 12:16:29 -0500
2293 changes by Paul Eggert and Joseph Myers
2295 modest tweaks to the tz-art.htm and tz-link.htm files
2298 Release 2000a - 2000-01-18 09:21:26 -0500
2300 changes by Paul Eggert
2302 The two hypertext documents have also been renamed.
2305 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
2307 Paul Eggert's changes
2309 additions to the "zic" manual page and the "Arts.htm" file
2312 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
2317 Release data1999h - 1999-10-07 03:50:29 -0400
2319 changes by Paul Eggert to "europe" (most importantly, fixing
2320 Lithuania and Estonia)
2323 Release 1999g - 1999-09-28 11:06:18 -0400
2325 data changes by Paul Eggert (most importantly, the change for
2326 Lebanon that buys correctness for this coming Sunday)
2328 The "code" file contains changes to "Makefile" and "checktab.awk" to
2329 allow better checking of time zone files before they are published.
2332 Release 1999f - 1999-09-23 09:48:14 -0400
2334 changes by Arthur David Olson and Paul Eggert
2337 Release 1999e - 1999-08-17 15:20:54 -0400
2339 changes circulated by Paul Eggert, although the change to handling
2340 of DST-specifying time zone names has been commented out for now
2341 (search for "XXX" in "localtime.c" for details). These files also
2342 do not make any changes to the start of DST in Brazil.
2344 In addition to Paul's changes, there are updates to "Arts.htm" and
2348 Release 1999d - 1999-03-30 11:31:07 -0500
2350 changes by Paul Eggert
2352 The Makefile's "make public" rule has also been changed to do a test
2353 compile of each individual time zone data file (which should help
2354 avoid problems such as the one we had with Nicosia).
2357 Release 1999c - 1999-03-25 09:47:47 -0500
2359 changes by Paul Eggert, most importantly the change for Chile.
2362 Release 1999b - 1999-02-01 17:51:44 -0500
2364 changes by Paul Eggert
2366 code changes (suggested by Mani Varadarajan, mani at be.com) for
2367 correct handling of symbolic links when building using a relative directory
2369 code changes to generate correct messages for failed links
2371 updates to the URLs in Arts.htm
2374 Release 1999a - 1999-01-19 16:20:29 -0500
2376 error message internationalizations and corrections in zic.c and
2377 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
2381 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
2383 changes for Brazil, Chile, and Germany
2385 support for use of "24:00" in the input files for the time zone compiler
2388 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
2390 changes by Paul Eggert
2392 correction to a define in the "private.h" file
2395 Release data1998g - 1998-08-11 03:28:35 -0000
2396 [tzdata1998g.tar.gz is missing!]
2398 Lithuanian change provided by mgedmin at pub.osf.it
2400 Move creation of the GMT link with Etc/GMT to "etcetera" (from
2401 "backward") to ensure that the GMT file is created even where folks
2402 don't want the "backward" links (as suggested by Paul Eggert).
2405 Release data1998f - 1998-07-20 13:50:00 -0000
2406 [tzdata1998f.tar.gz is missing!]
2408 Update the "leapseconds" file to include the newly-announced
2409 insertion at the end of 1998.
2412 Release code1998f - 1998-06-01 10:18:31 -0400
2414 addition to localtime.c by Guy Harris
2417 Release 1998e - 1998-05-28 09:56:26 -0400
2419 The Makefile is changed to produce zoneinfo-posix rather than
2420 zoneinfo/posix, and to produce zoneinfo-leaps rather than
2423 data changes by Paul Eggert
2425 changes from Guy Harris to provide asctime_r and ctime_r
2427 A usno1998 file (substantially identical to usno1997) has been added.
2430 Release 1998d - 1998-05-14 11:58:34 -0400
2432 changes to comments (in particular, elimination of references to CIA maps).
2433 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
2434 where changes occur.
2437 Release 1998c - 1998-02-28 12:32:26 -0500
2439 changes by Paul Eggert (save the "French correction," on which I'll
2440 wait for the dust to settle)
2444 changes and additions to Arts.htm
2447 Release 1998b - 1998-01-17 14:31:51 -0500
2449 URL cleanups and additions
2452 Release 1998a - 1998-01-13 12:37:35 -0500
2454 changes by Paul Eggert
2457 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
2459 changes by Paul Eggert, with minor modifications from Arthur David
2460 Olson to make the files more browser friendly
2463 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
2465 minor changes to put "TZif" at the start of each time zone information file
2467 a rule has also been added to the Makefile so you can
2469 to just recompile the zone information files (rather than doing a
2470 full "make install" with its other effects).
2473 Release data1997i - 1997-10-07 08:45:38 -0400
2475 changes to Africa by Paul Eggert
2478 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
2480 corrections for Uruguay (and other locations)
2482 Arthur David Olson's simple-minded fix allowing mktime to both
2483 correctly handle leap seconds and correctly handle tm_sec values
2484 upon which arithmetic has been performed.
2487 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
2489 Paul Eggert's updates
2491 a small change to a function prototype;
2493 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
2494 include information on Around the World in Eighty Days.
2497 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
2499 fixes to zic's error handling
2501 changes inspired by the item circulated on Slovenia
2503 The description of Web resources has been HTMLified for browsing
2506 A new piece of tz-related music has been added to the "Music" file.
2509 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
2511 Paul Eggert's latest suggestions
2514 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
2516 changes to "zic.c" to correct performance of the "-s" option
2518 a new file "usno1997"
2521 Release data1997c - 1997-03-04 09:58:18 -0500
2526 Release 1997b - 1997-02-27 18:34:19 -0500
2528 The data file incorporates the 1997 leap second.
2530 The code file incorporates Arthur David Olson's take on the
2531 zic/multiprocessor/directory-creation situation.
2534 Release 1997a - 1997-01-21 09:11:10 -0500
2536 Paul Eggert's Antarctica (and other changes)
2538 Arthur David Olson finessed the "getopt" issue by checking against
2539 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
2540 is returned while SunOS 5.5's manual says EOF is returned).
2543 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
2545 Paul Eggert's latest changes
2548 Release code1996n - 1996-12-16 09:42:02 -0500
2550 link snapping fix from Bruce Evans (via Garrett Wollman)
2553 Release data1996m - 1996-11-24 02:37:34 -0000
2554 [tzdata1996m.tar.gz is missing!]
2556 Paul Eggert's batch of changes
2559 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
2561 No functional changes here; the files have simply been changed to
2562 make more use of ISO style dates in comments. The names of the above
2563 files now include the year in full.
2566 Release code96l - 1996-09-08 17:12:20 -0400
2568 tzcode96k was missing a couple of pieces.
2571 Release 96k - 1996-09-08 16:06:22 -0400
2573 the latest round of changes from Paul Eggert
2575 the recent Year 2000 material
2578 Release code96j - 1996-07-30 13:18:53 -0400
2580 Set sp->typecnt as suggested by Timothy Patrick Murphy.
2583 Release code96i - 1996-07-27 20:11:35 -0400
2585 Paul's suggested patch for strftime %V week numbers
2588 Release data96i - 1996-07-01 18:13:04 -0400
2590 "northamerica" and "europe" changes by Paul Eggert
2593 Release code96h - 1996-06-05 08:02:21 -0400
2595 fix for handling transitions specified in Universal Time
2597 Some "public domain" notices have also been added.
2600 Release code96g - 1996-05-16 14:00:26 -0400
2602 fix for the simultaneous-DST-and-zone-change challenge
2605 Release data96h - 1996-05-09 17:40:51 -0400
2607 changes by Paul Eggert
2610 Release code96f-data96g - 1996-05-03 03:09:59 -0000
2611 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
2613 The changes get us some of the way to fixing the problems noted in Paul
2614 Eggert's letter yesterday (in addition to a few others). The approach
2615 has been to make zic a bit smarter about figuring out what time zone
2616 abbreviations apply just after the time specified in the "UNTIL" part
2617 of a zone line. Putting the smarts in zic means avoiding having
2618 transition times show up in both "Zone" lines and "Rule" lines, which
2619 in turn avoids multiple transition time entries in time zone files.
2620 (This also makes the zic input files such as "europe" a bit shorter and
2621 should ease maintenance.)
2624 Release data96f - 1996-04-19 19:20:03 -0000
2625 [tzdata96f.tar.gz is missing!]
2627 The only changes are to the "northamerica" file; the time zone
2628 abbreviation for Denver is corrected to MST (and MDT), and the
2629 comments for Mexico have been updated.
2632 Release data96e - 1996-03-19 17:37:26 -0500
2634 Proposals by Paul Eggert, in particular the Portugal change that
2635 comes into play at the end of this month.
2638 Release data96d - 1996-03-18 20:49:39 -0500
2643 Release code96e - 1996-02-29 15:43:27 -0000
2644 [tzcode96e.tar.gz is missing!]
2646 internationalization changes and the fix to the documentation for strftime
2649 Release code96d-data96c - 1996-02-12 11:05:27 -0500
2651 The "code" file simply updates Bob Kridle's electronic address.
2653 The "data" file updates rules for Mexico.
2656 Release data96b - 1996-01-27 15:44:42 -0500
2661 Release code96c - 1996-01-16 16:58:15 -0500
2663 leap-year streamlining and binary-search changes
2668 Release code96b - 1996-01-10 20:42:39 -0500
2670 fixes and enhancements from Paul Eggert, including code that
2671 emulates the behavior of recent versions of the SunOS "date"
2675 Release 96a - 1996-01-06 09:08:24 -0500
2679 fixes to strftime.c for correct ISO 8601 week number generation,
2680 plus support for two new formats ('G' and 'g') to give ISO 8601 year
2681 numbers (which are not necessarily the same as calendar year numbers)
2684 Release code95i-data95m - 1995-12-21 12:46:47 -0500
2686 The latest revisions from Paul Eggert are included, the usno1995
2687 file has been updated, and a new file ("WWW") covering useful URLs
2691 Release code95h-data95l - 1995-12-19 18:10:12 -0500
2693 A simplification of a macro definition, a change to data for Sudan,
2694 and (for last minute shoppers) notes in the "Music" file on the CD
2698 Release code95g-data95k - 1995-10-30 10:32:47 -0500
2700 (slightly reformatted) 8-bit-clean proposed patch
2702 minor patch: US/Eastern -> America/New_York
2704 snapshot of the USNO's latest data ("usno1995")
2706 some other minor cleanups
2709 Release code95f-data95j - 1995-10-28 21:01:34 -0000
2710 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
2714 support for 64-bit time_t's
2716 optimization in localtime.c
2719 Release code95e - 1995-10-13 13:23:57 -0400
2721 the mktime change to scan from future to past when trying to find time zone
2725 Release data95i - 1995-09-26 10:43:26 -0400
2727 For Canada/Central, guess that the Sun customer's "one week too
2728 early" was just a approximation, and the true error is one month
2729 too early. This is consistent with the rest of Canada.
2732 Release data95h - 1995-09-21 11:26:48 -0400
2734 latest changes from Paul Eggert
2737 Release code95d - 1995-09-14 11:14:45 -0400
2739 the addition of a "Music" file, which documents four recorded
2740 versions of the tune "Save That Time".
2743 Release data95g - 1995-09-01 17:21:36 -0400
2745 "yearistype" correction
2748 Release data95f - 1995-08-28 20:46:56 -0400
2750 Paul Eggert's change to the australasia file
2753 Release data95e - 1995-07-08 18:02:34 -0400
2755 The only change is a leap second at the end of this year.
2756 Thanks to Bradley White for forwarding news on the leap second.
2759 Release data95d - 1995-07-03 13:26:22 -0400
2761 Paul Eggert's changes
2764 Release data95c - 1995-07-02 19:19:28 -0400
2766 changes to "asia", "backward", "europe", and "southamerica"
2767 (read: northamericacentrics need not apply)
2770 Release code95c - 1995-03-13 14:00:46 -0500
2772 one-line fix for sign extension problems in detzcode
2775 Release 95b - 1995-03-04 11:22:38 -0500
2777 Minor changes in both:
2779 The "code" file contains a workaround for the lack of "unistd.h" in
2780 Microsoft C++ version 7.
2782 The "data" file contains a fixed "Link" for America/Shiprock.
2785 Release 94h - 1994-12-10 12:51:14 -0500
2789 * incorporate the changes to "zdump" and "date" to make changes to
2790 the "TZ" environment variable permanent;
2792 * incorporate the table changes by Paul Eggert;
2794 * include (and document) support for universal time specifications in
2795 data files - but do not (yet) include use of this feature in the
2798 Think of this as "TZ Classic" - the software has been set up not to break if
2799 universal time shows up in its input, and data entries have been
2800 left as is so as not to break existing implementations.
2803 Release data94f - 1994-08-20 12:56:09 -0400
2805 (with thanks!) the latest data updates from Paul Eggert
2808 Release data94e - 1994-06-04 13:13:53 -0400
2813 Release code94g - 1994-05-05 12:14:07 -0400
2815 fix missing "optind.c" and a reference to it in the Makefile
2818 Release code94f - 1994-05-05 13:00:33 -0000
2819 [tzcode94f.tar.gz is missing!]
2821 changes to avoid overflow in difftime, as well as changes to cope
2822 with the 52/53 challenge in strftime
2825 Release code94e - 1994-03-30 23:32:59 -0500
2827 change for the benefit of PCTS
2830 Release 94d - 1994-02-24 15:42:25 -0500
2832 Avoid clashes with POSIX semantics for zones such as GMT+4.
2834 Some other very minor housekeeping is also present.
2837 Release code94c - 1994-02-10 08:52:40 -0500
2839 Fix bug where mkdirs was broken unless you compile with
2840 -fwritable-strings (which is generally losing to do).
2843 Release 94b - 1994-02-07 10:04:33 -0500
2845 work by Paul Eggert who notes:
2847 I found another book of time zone histories by E W Whitman; it's not
2848 as extensive as Shanks but has a few goodies of its own. I used it
2849 to update the tables. I also fixed some more as a result of
2850 correspondence with Adam David and Peter Ilieve, and move some stray
2851 links from 'europe' to 'backward'. I corrected some scanning errors
2854 As far as the code goes, I fixed zic to allow years in the range
2855 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
2856 And I cleaned up the zic documentation a little bit.
2859 Release data94a - 1994-02-03 08:58:54 -0500
2861 It simply incorporates the recently announced leap second into the
2865 Release 93g - 1993-11-22 17:28:27 -0500
2867 Paul Eggert has provided a good deal of historic information (based
2868 on Shanks), and there are some code changes to deal with the buglets
2869 that crawled out in dealing with the new information.
2872 Release 93f - 1993-10-15 12:27:46 -0400
2874 Paul Eggert's changes
2877 Release 93e - 1993-09-05 21:21:44 -0400
2879 This has updated data for Israel, England, and Kwajalein. There's
2880 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
2881 Thanks to Paul Eggert and Peter Ilieve for the changes.
2884 Release 93d - 1993-06-17 23:34:17 -0400
2886 new fix and new data on Israel
2889 Release 93c - 1993-06-06 19:31:55 -0400
2894 Release 93b - 1993-02-02 14:53:58 -0500
2896 updated "leapseconds" file
2899 Release 93 - 1993-01-08 07:01:06 -0500
2901 At kre's suggestion, the package has been split in two - a code piece
2902 (which also includes documentation) that's only of use to folks who
2903 want to recompile things and a data piece useful to anyone who can
2906 The new version has a few changes to the data files, a few
2907 portability changes, and an off-by-one fix (with thanks to
2908 Tom Karzes at deshaw.com for providing a description and a
2912 Release 92c - 1992-11-21 17:35:36 -0000
2913 [tz92c.tar.Z is missing!]
2915 The fallout from the latest round of DST transitions.
2917 There are changes for Portugal, Saskatchewan, and "Pacific-New";
2918 there's also a change to "zic.c" that makes it portable to more systems.
2921 Release 92 - 1992-04-25 18:17:03 -0000
2922 [tz92.tar.Z is missing!]
2924 By popular demand (well, at any rate, following a request by kre at munnari)
2927 The 1989 update of the time zone package featured:
2929 * POSIXization (including interpretation of POSIX-style TZ environment
2930 variables, provided by Guy Harris),
2931 * ANSIfication (including versions of "mktime" and "difftime"),
2932 * SVIDulation (an "altzone" variable)
2933 * MACHination (the "gtime" function)
2934 * corrections to some time zone data (including corrections to the rules
2935 for Great Britain and New Zealand)
2936 * reference data from the United States Naval Observatory for folks who
2937 want to do additional time zones
2938 * and the 1989 data for Saudi Arabia.
2940 (Since this code will be treated as "part of the implementation" in some
2941 places and as "part of the application" in others, there's no good way to
2942 name functions, such as timegm, that are not part of the proposed ANSI C
2943 standard; such functions have kept their old, underscore-free names in this
2946 And the "dysize" function has disappeared; it was present to allow
2947 compilation of the "date" command on old BSD systems, and a version of "date"
2948 is now provided in the package. The "date" command is not created when you
2949 "make all" since it may lack options provided by the version distributed with
2950 your operating system, or may not interact with the system in the same way
2951 the native version does.
2953 Since POSIX frowns on correct leap second handling, the default behavior of
2954 the "zic" command (in the absence of a "-L" option) has been changed to omit
2955 leap second information from its output files.
2961 This file contains copies of the part of each release announcement
2962 that talks about the changes in that release. The text has been
2963 adapted and reformatted for the purposes of this file.
2965 Typically a release R consists of a pair of tarball files,
2966 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
2967 code2010a, data2012c) consist of just one or the other tarball, and a
2968 few (e.g., code2012c-data2012d) have tarballs with mixed version
2971 Release time stamps are taken from the release's commit (for newer,
2972 git releases), from the newest file in the tarball (for older
2973 releases, where this info is available) or from the email announcing
2974 the release (if all else fails; these are marked with a time zone of
2975 -0000 and an "is missing!" comment).
2977 Earlier versions of the code and data were not announced on the tz
2978 list and are not summarized here.
2980 This file is in the public domain.